refactor: Database 설정 보안 강화 (한글 주석 인코딩 문제 수정/DB PW 환경변수 대체) #9
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refactor: DB 설정 개선 및 보안 강화 (Improve database configuration and security)
Security best practices에 맞게 코드를 개선하고 DB 연결 안정성을 높였습니다.